@joelwhrs wrote:
I am having a very weird echo with a single client that has a SIP trunk with VoIP Innovations. They can randomly hear an echo of themselves. The person on the other end has crystal clear audio with no echo. There doesn’t seem to be any rhyme or reason as to what types of calls echo, as it happens for other people on SIP trunks, analog lines, and cell phones. I know that echos are usually associated with calling analog lines, yet it definitely isn’t limited to this as they even had an echo when calling us (we are on VoIP Innovations as well). When a call is established between 2 VoIP Innovations clients, the RTP traffic is routed between the 2 endpoint RTPs without being relayed by the provider, which rules out any issues on the providers end.
I got a packet capture while I was on the phone with them and they said they had a very slight echo. I checked the packets and sure enough, I could ever so slightly hear the caller on the callers inbound RTP stream (me talking). I did not hear any echo on my end while I was on the phone. The packets only show a max jitter of 9.67ms and an average of .37ms.
The PBX is NAT’d behind a Sophos XG firewall with QOS enabled and priority given to SIP and RTP. This client is setup exactly the same as our other clients, with the exception of the Sophos XG UTM. Our other clients are using Sophos UTM 9 products. We’ve never experienced this issue before.
Any ideas on next steps? I’m getting towards the end of my abilities on this one.
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